package com.xukang.aes.utils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * @author 种晓阳
 *	AES对称加解密工具类
 */
public class AESUtil3 {
	/**
	 * AES加密后base64编码
	 * @param str
	 * @param password
	 * @return
	 */
	public static String encode(String str,String password){
		return Base64Encoder(encrypt(str,password));
	}
	/**
	 * base64解码后AES解密
	 * @param str
	 * @param password
	 * @return
	 */
	public static String decode(String str,String password){
		return new String(decrypt(Base64Decoder(str), password));
	}
	/** 
	 * 加密 
	 *  
	 * @param content 需要加密的内容 
	 * @param password  加密密码 
	 * @return 返回二进制
	 */  
	public static byte[] encrypt(String content, String password) {  
	        try {             
	                KeyGenerator kgen = KeyGenerator.getInstance("AES");  
	                kgen.init(128, new SecureRandom(password.getBytes()));  
	                SecretKey secretKey = kgen.generateKey();  
	                byte[] enCodeFormat = secretKey.getEncoded();  
	                SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");  
	                Cipher cipher = Cipher.getInstance("AES");// 创建密码器  
	                byte[] byteContent = content.getBytes("utf-8");  
	                cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化  
	                byte[] result = cipher.doFinal(byteContent);  
	                return result; // 加密  
	        } catch (NoSuchAlgorithmException e) {  
	                e.printStackTrace();  
	        } catch (NoSuchPaddingException e) {  
	                e.printStackTrace();  
	        } catch (InvalidKeyException e) {  
	                e.printStackTrace();  
	        } catch (UnsupportedEncodingException e) {  
	                e.printStackTrace();  
	        } catch (IllegalBlockSizeException e) {  
	                e.printStackTrace();  
	        } catch (BadPaddingException e) {  
	                e.printStackTrace();  
	        }  
	        return null;  
	}
	/**解密 
	 * @param content  待解密内容 
	 * @param password 解密密钥 
	 * @return 返回二进制
	 */  
	public static byte[] decrypt(byte[] content, String password) {  
	        try {  
	                 KeyGenerator kgen = KeyGenerator.getInstance("AES");  
	                 kgen.init(128, new SecureRandom(password.getBytes()));  
	                 SecretKey secretKey = kgen.generateKey();  
	                 byte[] enCodeFormat = secretKey.getEncoded();  
	                 SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");              
	                 Cipher cipher = Cipher.getInstance("AES");// 创建密码器  
	                cipher.init(Cipher.DECRYPT_MODE, key);// 初始化  
	                byte[] result = cipher.doFinal(content);  
	                return result; // 加密  
	        } catch (NoSuchAlgorithmException e) {  
	                e.printStackTrace();  
	        } catch (NoSuchPaddingException e) {  
	                e.printStackTrace();  
	        } catch (InvalidKeyException e) {  
	                e.printStackTrace();  
	        } catch (IllegalBlockSizeException e) {  
	                e.printStackTrace();  
	        } catch (BadPaddingException e) {  
	                e.printStackTrace();  
	        }  
	        return null;  
	}
	/**将二进制转换成16进制 
	 * @param buf 
	 * @return 
	 */  
	public static String parseByte2HexStr(byte buf[]) {  
	        StringBuffer sb = new StringBuffer();  
	        for (int i = 0; i < buf.length; i++) {  
	                String hex = Integer.toHexString(buf[i] & 0xFF);  
	                if (hex.length() == 1) {  
	                        hex = '0' + hex;  
	                }  
	                sb.append(hex.toUpperCase());  
	        }  
	        return sb.toString();  
	}
	/**将16进制转换为二进制 
	 * @param hexStr 
	 * @return 
	 */  
	public static byte[] parseHexStr2Byte(String hexStr) {  
	        if (hexStr.length() < 1)  
	                return null;  
	        byte[] result = new byte[hexStr.length()/2];  
	        for (int i = 0;i< hexStr.length()/2; i++) {  
	                int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);  
	                int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);  
	                result[i] = (byte) (high * 16 + low);  
	        }  
	        return result;  
	}
	/**
	 * 二进制转base64编码
	 * @param 二进制参数encoderBytes
	 * @return 字符串
	 */
	public static String Base64Encoder (byte[] encoderBytes){
		BASE64Encoder encoder = new BASE64Encoder();
		return encoder.encode(encoderBytes);
	}
	/**
	 * 字符串base64解码
	 * @param 字符串参数decoderStr
	 * @return 二进制
	 */
	public static byte[] Base64Decoder(String decoderStr){
		byte[] bt = null;    
	    try {    
	       BASE64Decoder decoder = new BASE64Decoder();
	       bt = decoder.decodeBuffer( decoderStr );    
	    } catch (IOException e) {    
	       e.printStackTrace();    
	    }    
		return bt;
	}

}
